<template>
	<div class="app-container">
		<!--表单-->
		<el-form :inline="true" class="demo-form-inline">
			<el-form-item>
				<el-select v-model="searchObj.type" clearable placeholder="请选择">
					<el-option label="学员登录数统计" value="login_num" />
					<el-option label="学员注册数统计" value="register_num" />
					<el-option label="课程播放数统计" value="video_view_num" />
					<el-option label="每日课程数统计" value="course_num" />
				</el-select>
			</el-form-item>
			<el-form-item>
				<el-date-picker
					v-model="searchObj.begin"
					type="date"
					placeholder="选择开始日期"
					value-format="yyyy-MM-dd"
				/>
			</el-form-item>
			<el-form-item>
				<el-date-picker
					v-model="searchObj.end"
					type="date"
					placeholder="选择截止日期"
					value-format="yyyy-MM-dd"
				/>
			</el-form-item>
			<el-button
				:disabled="btnDisabled"
				type="primary"
				icon="el-icon-search"
				@click="showChart"
				>查询</el-button
			>
		</el-form>
		<h3>{{title}}</h3>
		<div class="chart-container">
			<div id="chart" class="chart" style="height:500px;width:100%" />
		</div>
	</div>
</template>

<script>
import echarts from "echarts";
import daily from "@/api/statistics";

export default {
	data() {
		return {
			searchObj: {
				type: "",
				begin: "",
				end: ""
			},
			btnDisabled: false,
			chart: null,
			title: "",
			xData: [],
			yData: []
		};
	},
	methods: {
		showChart() {
			if(this.searchObj.type&&this.searchObj.begin&&this.searchObj.end){
				this.initChartData();
			}
			// this.setChart();
		},
		// 准备图表数据
		initChartData() {
			daily.getChartsData(this.searchObj).then(response => {
				// 数据
				this.yData = response.data.dataList;
				// 横轴时间
				this.xData = response.data.dateList;
				// 当前统计类别
				switch (this.searchObj.type) {
					case "register_num":
						this.title = "学员注册数统计";
						break;
					case "login_num":
						this.title = "学员登录数统计";
						break;
					case "video_view_num":
						this.title = "课程播放数统计";
						break;
					case "course_num":
						this.title = "每日课程数统计";
						break;
				}
				this.setChart();
			});
		},
		// 设置图标参数
		setChart() {
			// 基于准备好的dom，初始化echarts实例
			this.chart = echarts.init(document.getElementById("chart"));
			// console.log(this.chart)
			// 指定图表的配置项和数据
			var option = {
				// x轴是类目轴（离散数据）,必须通过data设置类目数据
				tooltip:{
					trigger:"axis",
				},
				xAxis: {
					type: "category",
					data: this.xData
				},
				// y轴是数据轴（连续数据）
				yAxis: {
					type: "value"
				},
				// 系列列表。每个系列通过 type 决定自己的图表类型
				series: [
					{
						// 系列中的数据内容数组
						data: this.yData,
						// 折线图
						type: "line"
					}
				]
			};
			this.chart.setOption(option);
		}
	}
};
</script>
